# Question

Calculate a confidence interval for assuming that each sample is from a normal population.

a. x-bar = 24, σ = 3, n = 10, 90 percent confidence

b. x-bar = 125, σ = 8, n = 25, 99 percent confidence

c. x-bar = 12.5, σ = 1.2, n = 50, 95 percent confidence

a. x-bar = 24, σ = 3, n = 10, 90 percent confidence

b. x-bar = 125, σ = 8, n = 25, 99 percent confidence

c. x-bar = 12.5, σ = 1.2, n = 50, 95 percent confidence

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